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Medicine & Science in Sports & Exercise:
SPECIAL COMMUNICATIONS: Methods

Body composition estimates from multicomponent models using BIA to determine body water

EVANS, ELLEN M.; ARNGRIMSSON, SIGURBJORN A.; CURETON, KIRK J.

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Abstract

EVANS, E. M., S. A. ARNGRIMSSON, and K. J. CURETON. Body composition estimates from multicomponent models using BIA to determine body water. Med. Sci. Sports Exerc., Vol. 33, No. 5, 2001, pp. 839–845.

Purpose: The purpose of this study was to compare estimates of body fat (%BF) from three- and four-component models with total body water (TBW) determined by single-frequency bioelectrical impedance analysis (BIA; %BF3C-BIA and %BF4C-BIA) to %BF estimates from densitometry (%BF2C-D) and from three- and four-component models with TBW determined using deuterium dilution (%BF3C-D2O and %BF4C-D2O), the criterion methods.

Methods: Measures of body density by hydrostatic weighing, TBW by BIA and D2O dilution, and bone mineral by dual energy x-ray absorptiometry (DXA) were obtained in 40 men and 93 women, 18–42 yr. TBW was estimated from BIA resistance (RJL analyzer) using an equation developed and cross-validated in two independent samples. Body fat was estimated using the three-component model of Siri (1961) and a four-component model modified from Lohman (1986).

Results: There was a strong relation and no significant difference between TBW estimated by BIA and D2O [r = 0.94, SEE = 2.4; T̄×Diff = 0.0 ± 2.4 L (SD), P > 0.05]. There were strong relations between methods for estimating %BF, with deviations from %BF4C-D2O (errors) for %BF3C-BIA [r = 0.99, SEE = 2.4% BF, T̄×Diff = −0.4 ± 2.4% BF (SD)] and %BF4C-BIA [r = 0.99, SEE = 2.3% BF, T̄×Diff = 0.2 ± 2.3% BF (SD)] being nonsignificant (P > 0.05) although greater than for %BF3C-D2O [r = 1.00, SEE = 0.5% BF, T̄×Diff = −0.6 ± 0.5% BF (SD)], and comparable or slightly worse than for %BF2C-D [r = 0.99, SEE = 2.3% BF, T̄×Diff = 0.4 ± 2.3% BF (SD)].

Conclusions: We conclude that because estimates of %BF from multicomponent models with TBW estimated from BIA are not more accurate than from body density alone using a two-component model, estimates of %BF from three- and four-component models using TBWBIA are not acceptable substitutes for estimates from the same models using TBWD2O.

© 2001 Lippincott Williams & Wilkins, Inc.

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